.navi_container {
	margin: 0;
	padding: 0;
}

.topmenu {
	background-color: #b1b0b0;
	margin: 0;
	padding: 0;
	position: fixed;
	top: 0;
	width: 100%;
	overflow: hidden;
	list-style-type: none;
}

.topmenu li {
	float: left;
}

.topmenu li a {
	display: inline-block;
	color: white;
	text-align: center;
	padding: 16px;
	text-decoration: none;
}

.topmenu li a.active {
	color: white;
	background-color: #6c6;
	cursor: pointer;
}

.topmenu li a:hover:not(.active) {
	background-color: #222;
	cursor: pointer;
}

.clear_fix:after {
	clear: both;
	content: '';
}

.column {
    padding:10px;
    float: left;
	margin-top: 53px;
}

.side_menu {
	width: 15%;
	overflow: hidden;
}

.side_menu ul {
	list-style-type: none;
	margin: 0;
	padding: 0;
}

.side_menu li a {
	text-decoration: none;
	display: block;
	background-color: #f2f2f2;
	padding: 20px;
	text-align: center;
}

.side_menu li:not(:first-child) {
	margin-top: 10px;
}

.side_menu li a:active {
	color: white;
	background-color: darkorange;
}

.side_menu li a:hover:not(.active) {
	color: white;
	background-color: burlywood;
}

.right_content {
	width: 80%;
}

.drop_menu_parent{
    display: inline-block;
    position: relative;
}

.drop_menu_content{
    border-radius: 2px;
    display: none;
    position: absolute;
    width: 100%;
    background-color: white;
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2);
}

.drop_menu_content p{
    margin: 0;
    color: darkblue;
    padding: 12px 16px;
}

.drop_menu_content p:hover{
    background-color: #222222;
    color: white;
}
.drop_menu_parent:hover .drop_menu_content{
    display: block;
}

.tooltip{
    background-color: #2d2d30;
    border-radius: 5px;
    position: absolute;
    padding: 10px;
    min-width: 300px;
    left: 130%;
    top: 20%;
    visibility: hidden;
    color: white;
    z-index: -1;
    /* 淡入 - 1秒内从 0% 到 100% 显示: */
    opacity: 0;
    transition: opacity 1s;
}

.drop_menu_parent:hover .tooltip{
    visibility: visible;
    opacity: 1;
}

.drop_menu_parent:hover .tooltip:before{
    position: absolute;
    right: 100%;
    top: 50%;
    margin-top: -5px;
    content: "";
    border: 5px solid transparent;
    border-right-color: #2d2d30;
}

.menu_anchor{
    display: inline-block;
    padding:20px;
    background-color: cornflowerblue;
    color: white;
}